PCR for capsular typing of Haemophilus influenzae.

Abstract:

:A PCR method for the unequivocal assignment of Haemophilus influenzae capsular type (types a to f) was developed. PCR primers were designed from capsule type-specific DNA sequences cloned from the capsular gene cluster of each of the six capsular types. PCR product was amplified only from the capsular type for which the primers were designed. Product was confirmed by using either an internal oligonucleotide or restriction endonuclease digestion. A total of 172 H. influenzae strains of known capsular type (determined genetically) comprising all capsular types and noncapsulate strains were tested by PCR capsular typing. In all cases the PCR capsular type corresponded to the capsular genotype determined by restriction fragment length polymorphism analysis of the cap region. When used in conjunction with PCR primers derived from the capsular gene bexA, capsulate, noncapsulate, and capsule-deficient type b mutant strains could be differentiated. PCR capsular typing overcomes the problems of cross-reaction and autoagglutination associated with the serotyping of H. influenzae strains. The rapid and unequivocal capsular typing method that is described will be particularly important for typing invasive H. influenzae strains isolated from recipients of H. influenzae type b vaccine.

journal_name

J Clin Microbiol

authors

Falla TJ,Crook DW,Brophy LN,Maskell D,Kroll JS,Moxon ER

doi

10.1128/JCM.32.10.2382-2386.1994

subject

Has Abstract

pub_date

1994-10-01 00:00:00

pages

2382-6

issue

10

eissn

0095-1137

issn

1098-660X

journal_volume

32

pub_type

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